Elementary Mine Survey Certificate Exam Practice Questions - Elementary Certificate In Mine Survey (South Africa) Exam

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An operator notices that when rotating a centered theodolite by 180°, the plate bubble runs off by 2 divisions. What does this indicate?

The optical plummet is out of adjustment. The plate bubble axis is not perpendicular to the vertical axis. The target is at a different elevation than the instrument. The trunnion axis is perpendicular to the vertical axis.

Correct Answer:

The plate bubble axis is not perpendicular to the vertical axis.

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